JPS6010998B2 - Horizontal retraction crane rocking prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing prevention device for a horizontal retracting crane that performs horizontal retracting and horizontal extruding operations via a retracting device, and particularly to a swing prevention device for a horizontal retracting crane that performs a horizontal retracting operation and a horizontal extruding operation via a retracting device. This invention relates to a swing prevention rhombus that is equipped with a swing energy absorption mechanism at the tip of the top boom to attenuate swing.

The prior art will be explained with reference to FIGS. 1 to 3.

Figure 1 is an overall diagram showing the outline of a horizontal retraction crane.
3 is a girder running on a running rail 2 laid on the ground;
is a mast installed on the girder 1, a main boom 5 is rotatably supported on the mast 3 via a pin 4, and a weight link 7 is swingably supported on the top of the mast 3 via a pin 6. has been done. 8 is a tension boom, one end of which is connected to the pin 6.

Reference numeral 9 denotes a top boom, one end of which is connected to the tip of the tension boom 8 via a pin 10, and the middle part connected to a pin 11.
It is connected to the tip of the main boom 5 via.

Reference numeral 12 denotes a retraction device, in which a retraction rod 13 and a tension bar 14 are connected to the main boom 5 via a pin 15, and the other end of the tension bar 14 is connected to one end of the weight link 7.

A balance weight 16 is attached to the weight link 7 in order to maintain the balance of the moment around the pin 4. Reference numeral 17 denotes a sheave (pulley) provided at the tip of the top boom 9, which guides the hoisting rope 18 through a groove on its circumference.

19 is a grab bucket suspended from the hoisting rope 18.

A conventional example of a hanging prosthesis prevention mechanism for a horizontal retraction crane having such a configuration is shown in FIGS. 2 and 3.

20 is a first link provided parallel to the tension boom 8, 21 is a second link provided parallel to the top boom 9, and these links are connected to each other by pins.

23 is the tip link, which connects the top boom 9 and the second link 2.
It is supported by 1.

A rod 22 is attached to the tip link 23, and a hoisting rope 18 extends from the tip of the top boom 9 to hang a load. The rod 22 is supported so as to be able to move up and down inside the tip link 23, and has a stopper 25 at its upper end.
A cushioning rubber 24 is attached to the lower end to reduce the impact when the suspended load is hoisted up. Additionally, a guide roller 26 is installed within the rod 22 to protect the hoisting lobe 18 . In the above-described rocking prevention mechanism, when the suspended load is hoisted up and reaches the position shown in FIG.
, is integrated with the tip link 23, and connects the top boom 9 and the second
It is in a state where it is fixed to the link 21 of. At this time, since the first link 20 and the second link 21 are provided, the rod 22 is always oriented vertically regardless of changes in the turning radius during retraction and extrusion, and therefore the suspended load is It is forced to move while being fixed vertically to the crane, which suppresses rocking. However, in the conventional device described above, the first link 20 and the second link 21 are connected to the tension boom 8 and the top boom 9, respectively.
The tip of the top boom 9 and the tip link 23 are required to form opposite sides of a parallelogram, which increases the weight, and does not reduce the impact force during braking.
The connecting part between the rod 22 and the hanging load needs to be made into a solid structure, which increases the weight of the material 3.Furthermore, a large cushioning material is required at the connecting part between the rod 22 and the suspended load, and the hoisting rope in that part is required. There were disadvantages such as causing 18 damage.

The present invention eliminates the above-mentioned drawbacks in the follow-up technology3, and prevents the swinging of the suspended load when the crane is braked by attenuating the swinging energy absorption mechanism attached to the tip of the top boom 9. The object of the present invention is to provide a swing prevention device for a horizontal retractable crane that makes it possible to do so. 4. The feature of the present invention is that the sheath that guides the hoisting rope is
The rope is eccentrically supported on the top boom by a crank, and a hydraulic cylinder is placed between the crank and the top boom, and the hydraulic cylinder absorbs the rotation of the crank caused by swinging of the rope, thereby preventing swinging. be. below,
The present invention will be explained with reference to the drawings.

FIG. 4 and FIG. 5 are a side view and a front view for explaining one embodiment of the present invention.

This is because the swing link in the present invention uses the central axis of rotation of the sheave as a crank pin, and the central axis of rotation of the crank is eccentrically pinned to the side surface of the tip of the top boom with respect to the central axis of rotation of the sheave. This is the case where the crank mechanism is used. 4 and 5, 30' is a hydraulic cylinder, 31 is a sheave rotation center axis, 32 is a crank rotation center axis, 33 is a crank pin, 34 is a crank arm, 3
5 is a link side, and 36 is a link connection side. Other symbols are the same as in FIG. Sheave rotation center shaft 31
and the crank pin 33 are integral, and are connected to the crank rotation center shaft 32 via the crank arm 34, and the crank rotation center shaft 32 is rotatable to a fixed position on the side surface of the tip end of the top boom 9. pinned to. The sheave 17 is connected to the sheave rotation center shaft 31, that is, the crank pin 33.
The hoisting rope 18 is rotatably held, and the vertical movement of the hoisting rope 18 is guided by a groove provided on the circumference. The link side 35 is fixedly attached to the crank rotation center shaft 31 so as to rotate integrally with the crank rotation center shaft 31. That is, the link piece 35 is fixed to a crank consisting of the crank rotation center shaft 32, the crank arm 34, and the crank pin 33. The above crank mechanism is connected to the hydraulic cylinder 3 via the link connection side 36.
It is connected to one end of 0. In the above configuration, if the grab bucket 19 swings in the direction of arrow A in FIG. 4, the sheave rotation center shaft 31 and crank rotation center shaft 32
Since the crank mechanism is eccentric and the crank rotation center shaft 32 is pinned to the side of the top boom 9, the swinging force acting on the sheave 17 is transferred to the end of the hydraulic cylinder 30 by the crank mechanism. The function is to stretch the part in the direction of arrow B.

As a result, the swinging energy of the grab bucket 19 is absorbed and the swinging of the grab bucket 19 is prevented. At this time, the crank rotation center shaft 32
The greater the distance between the sheave rotation center axis 31 and the sheave rotation center axis 31, the greater the rotational force becomes, and the runout energy absorption rate increases. Further, since the sheep 17 is eccentrically supported by a crank and the hydraulic cylinder 30 is provided between the crank and the top boom 9, the structure is small and lightweight, and the lifting height of the lifting tool can be increased. As is clear from the schematic diagram shown in FIG. 1, in a horizontal retraction crane, the inclination angle of the top boom 9 changes as the turning radius changes, so the position of the rod changes when the hydraulic cylinder 30 is in a stationary state. By using a hydraulic cylinder with a long stroke, swinging of the grab bucket 19 can be prevented regardless of the turning radius. It also has the effect of reducing the impact energy transmitted to each boom due to the swinging force of the hanging load during braking, preventing fatigue and damage to members, and extending the life of the machine. As explained above, according to the present invention, the swinging of the suspended load can be prevented by the mechanical mechanism regardless of changes in the turning radius of the horizontal retraction crane, so the impact energy during braking can be alleviated, and the Damage and vibration can be prevented.
The lifespan of machine parts can be extended, the structure can be made smaller and lighter, the lifting height of the lifting equipment can be increased, and the noise that has been raised as a problem with conventional cranes can be reduced, making it easier for operators to work. The environment is also better, and the vibrations of the suspended load are damped, which reduces work time, shortens cycle time, and improves work efficiency.

[Brief explanation of the drawing]

Figure 1 is an overall view of the horizontal retraction crane, Figure 2
The figure is an explanatory diagram of a conventional rocking prevention device, Figure 3 is a detailed view of the cylinder part of Figure 2, Figure 4 is a side view showing an embodiment of the present invention, and Figure 5 is a front view thereof. be. 9...Top boom, 17...Sheave, 30, 40...
... Hydraulic cylinder, 31 ... Sheave rotation center shaft, 32 ... Crank rotation center shaft, 33 ...
...Crank pin, 34...Crank arm, 35...Link side, 36...Link connection side. Fist/Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a horizontal retraction crane that performs horizontal retraction and extrusion operations via a retraction device, a crank is rotatably provided at the tip of the top boom of the crane, and a suspended load is attached to a crank pin eccentric to the central axis of rotation of the crank. A swing prevention device for a horizontal retractable crane, characterized in that a sheave for guiding a hoisting rope suspended from the crane is rotatably provided, and a hydraulic cylinder is extendably provided between a link fixed to the crank and the top boom. .